Cannot Save Duplicate Invoice Numbers Anymore

Please put the option to revert back to the original format where I can save invoices with duplicate invoice numbers! The new designs are not an issue, it is the technicality that is an issue. I need to get my work done. I have a lot of clients who all uses the same invoice numbers !!! I need to save my invoices so I can get my work done. This is going to be a big issue and a hassle for my clients !!!
The quickbooks team are changing the format on this website, and did not even provide a guide on how we can easily save our invoices if "duplicate numbers" aren't allowed.... very unprofessional. Making our work harder with no guide on how we can easily save invoices. If you are keeping the new designs, PLEASE let us save duplicate invoice numbers AT LEAST. 
There's NO WAY I can save only 1 invoice with the #17 and I have 50 other clients to bill....  Like, of course the number is already in use! I have 50 other clients that I bill that has used that same number already. As long as my company has clients, they will ALL go through using the same numbers, just under a different name.....
Please fix this, this was not a big issue that needed to be taken away.